A marketing researcher for a phone company surveys 70 people and finds that the proportion of customers who are likely to switch providers when their contract expires is 15%. a) What is the standard deviation of the sampling distribution of the proportion?b) If she wants to reduce the standard deviation by half, how large a sample size would she need?
A marketing researcher for a phone company surveys 70 people and finds that the proportion of customers who are likely to switch providers when their contract expires is 15%. a) What is the standard deviation of the sampling distribution of the proportion?b) If she wants to reduce the standard deviation by half, how large a sample size would she need?
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section11.4: Collecting Data
Problem 5E
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A marketing researcher for a phone company surveys 70 people and finds that the proportion of customers who are likely to switch providers when their contract expires is 15%.
a) What is the standard deviation of the sampling distribution of the proportion?
b) If she wants to reduce the standard deviation by half, how large a
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